Disorders of red blood cells can be detected by obtaining counts of these immature erythrocytes.

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Reticulocytes are immature red blood cells that still contain remnants of ribosomal RNA, which can be visualized under a microscope with special stains. The presence of abnormal numbers of reticulocytes can indicate various disorders of red blood cells, such as anemia or hemolysis.

None of the other choices are directly involved in the production or detection of red blood cells. Myeloid refers to a group of white blood cells involved in immune defense, eosinophil is a type of white blood cell that is elevated in certain allergic or parasitic conditions, and lymphoid/lymphocyte refers to another group of white blood cells involved in immune defense.

Disorders of Red Blood Cells Can Be Detected by Obtaining